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Page 51
CHAPTER EIGHT
SECTION 8.1
MAST PLATE AND DOUBLE TRUSS (continued)
SECURE THE MAST PLATE TO THE BOOM
Attach the other half of the 3” aluminum saddles and thread on the 5/16” Nylock nuts (PN 60-0046). Tight-
en the nuts until the boom is snug, but you can still rotate it. Place the remaining two 7/16” flat washers
onto the threaded bolt as shown in
figure 8.10.
Insert a 7/16” Nylock nut onto the 7/16” x 5” threaded bolt
as shown in
figure 8.11
. Tighten the Nylock nut until it is resting near the galvanized washers as shown in
figure 8.12
.
Take care to liberally coat the bolt with anti-seize when securing the Nylock nut.
The Nylon
inside the nut causes friction which creates heat, and this can lead to galling of the threads on the bolt.
Use a short level and attach a wrench on each of the 7/16” “leveling” nuts as shown in
figure 8.13
. Adjust
the nuts as needed to level the boom to the mast plate. When the mast plate is level with the boom, tight-
en all of the nuts firmly, and don’t forget to install the set screws in the saddles as shown in
figure 8.14
.
Only the exposed half of the saddles will require a set screw.
Figure 8.15
shows the completed mast plate assembly.
FIG. 8.11
FIG. 8.10
FIG. 8.12
FIG. 8.14
FIG. 8.15
FIG. 8.13
